You have two options:Stick with official plug and play devices like (s)nes classic mini Start a new hobby creating your own personalized Retropie system by starting from scratch. It's not that hard. All the information is readily available on this website. You may want to invest in a quality micro sd card first.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first